Well tool



Patented Oct. 23, 1923.

STATES JOHN W. HOOSER, F DALLAS, 1! z *1 Z TOOL.

Application filed December 31, 1921. Serial No. 528,875.

To all whom it may camera:

Be it known that I, JoHN W. Hoosnn, a citizen of the United States,residing at Dallas in the county of Dallas and State- 6 of Texas, haveinvented certain new and useful Improvements in Well Tools, of which thefollowing is a specification.

This invention relates to improvements in well tools, particularly suchtools as are used in the operation of drilling wells for oil and has forits object the provision of a tool for attachment to the drill stem orcable of the well drilling apparatus or rig and lowered into the hole towithdraw or remove casing or pipe which has become broken ordisconnected from the drill stem or cable of the well boring machinery.

Another advantage of the tool is its simplicity, combined with its greatstrength and durabilityit having also an arrangement for keeping itsgripping parts free from mud, slime, or the like, to prevent slippingand enable the tool to more firmly grasp the casing to be removed. Inthe carrying out of the invention, there is provided a shank with acylindrical upper portion screw-threaded for attaching to the drillstem, the lower end of the shank being broader and slightly curved tolie against the pipe coupling. To the lower extremity of the shank isattached a member which partly encloses the casing or pipe and abuts thecoupling upon which the pull or strain is exerted by the tool to liftthe casing.

The invention will be more clearly understood by reference to theaccompanying drawing, forming part hereof, in which'- Figure 1 is a sideelevationalview of the invention attached to a portion of a drill stem,the view partly broken and sectioned for the purpose of illustration.

Figure 2 is a side elevational view of the tool removed from the drillstem or cable and partly sectioned, looking at the left hand edge of thewidened portion or shank.

Figure 3 is an enlarged detailed view of the lower or gripping end ofthe tool, attached to a portion of Well casing and showing the manner ofgripping same when re moving it from the well; and

Figure 4; i a cross-sectional view of the tool, the view being taken online 44 of Figure 1.

Referring more particularly to the draw ings, 1 denotes a portion of adrill stem, the stem in broken formation for convenienceof'illustration, the lower section of which is screw-threaded for thereception of the rounded, cylindrical head 2 of the tool. 3 represents acoupling for connecting the stem and tool.

The head or rounded portion 2 of the tool is channeled as at 4,diagonally of the head 2, for admission of water for the purpose ofkeeping the tool free from mud, &c., to enable it to firmly engage thepipe 5.

The lower portion or shank 6 of the tool, as will be seen by referenceto Figure 4, has a slight. concavo-convex formation so that the innerface 7 will closely abut the pipe coupling 8.

On the lower extremity of the shank 6 is formed a semi-circular grippingmember 9 which consists of a piece of steel bent upon itself, theportion 10 forming the arc of a circle and adapted to closely engage oneside of the pipe or casing 5, so that the coupling 8 will lie upon thetop edge of the member 9 as shown in Figure 3 and the concavity 7 willlie against the pipe coupling 8.

In practice the tool, attached to the drill stem 1, is lowered into thewell to where the casing has broken or become disconnected and which itis desired to remove, and

the tool is slipped by the Walls of the well and the casing (thereusually being sufiicient space around the casing in the hole for thepassage of the tool) then moved against the pipe 5 or casing until theportion 10 of the member 9 comes up under the coupling 8 and theinnerface 7 of the shank 6 abuts the coupling 8. The well machinery maynow be started to exert a pull upon the cable carrying the drill stemand tool, and thus lift the casing from the hole.

What is claimed is- 1. In a well tool, a shank having a threaded upperend and having a lower end of attenuated concavo-convex cross-sectionand a substantially U -shaped gripping member rigidly secured to thelower end of the shank at a point along one side of said 'U-shapedsubstantially U shaped gripping memberrigldly secured to the lower endof the shank at a point along one side of said U-shaped 1 member.

In testimony whereof I have signed my name to this specification.

JOHN W. HOOSER.

